Preparation code

<script src="//ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script>
<script src="http://shovkoplyas.pro/sugar-1.2.1.min.js"></script>
<script>
function clone(obj) {
   var target = {};
   for (var i in obj) {
    if (obj.hasOwnProperty(i)) {
     target[i] = obj[i];
    }
   }
   return target;
  }

function merge(destination, source) {
   for (var i in source) {
    if (source.hasOwnProperty(i)) {
     destination[i] = source[i];
    }
   }
   return destination;
  }
</script>
<script>
  Benchmark.prototype.setup = function() {
    o = {
      a: 1, b: 2, c: 3, d: 4,
      e: { a: 1, b: 2, c: 3, d: 4 },
      f: { a: 1, b: 2, c: 3, d: 4 },
      g: 
        [
          {a: 1, b: 2, c: 3, d: 4},
          {a: 1, b: 2, c: 3, d: 4}
        ]
    }
    
    u = {
      foo: 'bar',
      baz: 'trololo'
    }
  };
</script>

Preparation code output

Test runner

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Java applet disabled.

var foo = jQuery.extend({}, o);

var foo = clone(o)

var foo = merge(u, o)

var foo = Object.clone(o)

var foo = Object.merge(u, o)

var foo = jQuery.extend(true, u, o);

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